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7a+15=3a-9
We move all terms to the left:
7a+15-(3a-9)=0
We get rid of parentheses
7a-3a+9+15=0
We add all the numbers together, and all the variables
4a+24=0
We move all terms containing a to the left, all other terms to the right
4a=-24
a=-24/4
a=-6
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